Buzzer, also known as piezoelectric ceramic buzzer, is one of the most widely used products in piezoelectric ceramics. Buzzer is the main component of piezoelectric buzzer.
Composition of buzzer
The buzzer is made of lead zirconate titanate or lead magnesium niobate piezoelectric ceramic materials. Silver electrodes are plated on both sides of the ceramic sheet. After polarization and aging treatment, they are bonded with brass sheet or stainless steel sheet.
Principle of buzzer
Buzzer is based on the principle of piezoelectric effect. When alternating voltage is applied to it, it will produce mechanical vibration; On the contrary, when mechanical force is applied to it, it will also produce voltage signal. Therefore, the piezoelectric ceramic buzzer can be used as a vibration sensor. The voltage signal generated by piezoelectric ceramic buzzer under mechanical force is very weak. Generally, it should be connected to voltage amplifier when it is used as vibration sensor.
Quality discrimination of Fengming tablets
The quality of the buzzer can be easily detected with a mechanical multimeter. The method is as follows:
Turn the multimeter to the 25V gear, gently hold both sides of the buzzer chip with the left thumb and index finger, hold two pens with the right hand, the red pen approaches the potato chip, and the black pen is placed horizontally on the surface of the buzzer chip. Then press the left thumb and index finger hard, and then relax. Two voltage signals with opposite polarity are generated on the buzzer chip, making the pointer swing to the right - return to zero - swing to the left - return to zero, The swing is about 0.1 ~ 0.15v. If the test is repeated after changing the position of the probe, the order of pointer swing is swing to the left - return to zero - swing to the right - return to zero. Under the same pressure, the greater the swing of the pointer, the higher the sensitivity of the buzzer. If the pointer does not move, it indicates that the internal leakage or damage of the buzzer.
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